Folding knife casing



FIG. 1 is a first perspective view of my new design of a casing for a folding knife, the knife blade being shown in phantom for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 if a bottom plan view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a front elevation view thereof; and,

FIG. 8 is a rear elevation view thereof. 

The ornamental design for a folding knife casing, as shown and described. 